spn-reviewlisted

Analyzes SQL Server SPN (Service Principal Name) configuration and Kerberos delegation settings to diagnose authentication failures, NTLM fallback, and double-hop connectivity problems. Use this skill when users receive Kerberos errors, linked servers fall back to NTLM, AG listener connections fail, or constrained delegation is needed for a middle-tier application, and you need to identify missing, duplicate, or misconfigured SPNs and delegation settings. Applies 40 checks (K1–K40) covering SPN presence, service account binding, AG listener and alias, permissions, Kerberos delegation, AD account sensitivity, Azure AD hybrid, and advanced gMSA/FCI/delegation scenarios.
vanterx/mssql-performance-skills · ★ 1 · API & Backend · score 77

Install: claude install-skill vanterx/mssql-performance-skills

# SQL Server SPN and Kerberos Delegation Review Skill ## Purpose Analyze SQL Server SPN configuration and Active Directory delegation attributes to surface Kerberos authentication failures, NTLM fallback causes, and double-hop connectivity problems. Applies 40 checks (K1–K40) across seven categories: - **K1–K6** — MSSQLSvc SPN presence: default instance, named instance, FQDN variant, short-hostname variant, port mismatch, and FCI Virtual Network Name - **K7–K11** — Service account binding: SPN on wrong account, duplicate SPNs, machine account vs domain account, stale SPNs from old accounts, MSA/gMSA auto-registration gaps - **K12–K16** — AG listener and alias: listener SPN, named instance port conflict, SQL Browser, alias SPN, multi-subnet listener coverage - **K17–K20** — Configuration and permissions: HTTP SPN, registration permission gap, unconstrained delegation, NTLM fallback signal - **K21–K25** — Kerberos delegation — service account: constrained delegation (KCD) not configured, missing target SPN, protocol transition, RBCD misconfiguration, delegation scope - **K26–K30** — AD account and computer sensitivity: AccountNotDelegated on end-user, Protected Users membership on end-user, computer account SPN conflict, computer account unconstrained delegation, service account in Protected Users - **K31–K40** — Azure AD / hybrid and advanced scenarios: Entra ID hybrid SPN gap, Entra-only auth with orphaned AD SPN, Azure SQL MI on-premises SPN, gMSA rollover